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About Building Information Modeling (BIM)

Building Information Modeling is a design and documentation methodology based on coordinated, high quality information. It enables design and construction teams to create and manage information about a building project consistently and reliably across the scope of the project. The information is stored in a single building model. This ensures that information is coordinated, consistent, and complete.

BIMBuilding Information modeling supports

large team workflows to improve project understanding and enable more predictabe outcomes. The visibility that BIM provides to all members of the project team contributes to its success through better coordination, improved accurary and the ability to make more informed decisions earlier in the process.

Autodesk Revit Structure and Building Information Modeling

Revit Structure is a purpose-built software for building information modeling.

Traditional drafting CAD software represent geometry of a design by using stylized symbols from designated illustrations. Some examples of these illustrations may be a series of plans, elevations, and sections. These illustrations are essentially independent of one another. Building information modeling software represents as series of intelligent objects and elements such as walls, beams, schedules, and plan views. These objects and elements have parametric attributes. The information about these objects and elements is stored in a single building model. You can extract any number of different views of the data from the model.

Bidirectional AssociativityBidirectional associativity is the ability of the building

information model to coordinate changes made in any view and propagate these changes out to all other views. Bidirectional associativity is applied automatically to every component, view, and annotation. For example, a change in the size and location of a column is reflected in all plans, details, and schedules; all of which are associated with the column and influenced by the changes and are automatically adjusted. Revit helps ensure that plans, schedules, and building sections and elevations are immediately available, up-to-date, and accurate.

For example: Flip a section line and all views update

Example of Bidirectional Associativity

Flip a section line and all view updates

Draw a wall in plan and it appears in all other views including material takeoffs

Change a beam or column type in a schedule and the change propagates throughout the graphical and non-graphical views

Parametric RelationshipThe term parametric refers to the relationships

among the elements of a building design model. These relationships are created either automatically by the software or by you. In mathematics and mechanical CAD, the numbers of characteristics that define these relationships are called parameters; therefore, the operation of the software is called parametric. It is these parametric relationships that deliver fundamental coordination and productivity benefits provided by the building information modeling methodoly.

Example of Parametric Relationships

Beams attached to supporting columns located on column grids. When a grid moves, the column moves with it and the beams length adjust accordingly

A structural truss modeled using constraints that define the number of bays and lengths of diagonals. When the span of the truss changes, vertical members are added where necessary and the diagonal web members adjust accordingly.

Sample (3d View)

Plan

Plan

Elevation

Section

Column Schedule